/* ============================================================
   learn-series.css
   Premium rendering system for learn landing and article pages
   ============================================================ */

:root {
    --ls-text-primary: var(--pui-color-text-primary);
    --ls-text-secondary: var(--pui-color-text-secondary);
    --ls-text-muted: var(--pui-color-text-muted);
    --ls-toc-text: var(--pui-color-text-secondary);
    --ls-bg-page: var(--pui-color-surface-page);
    --ls-bg-section: var(--pui-color-surface-muted);
    --ls-bg-component: var(--pui-color-surface-muted);
    --ls-border: var(--pui-color-border-default);
    --ls-accent: var(--pui-color-link);
    --ls-accent-soft: var(--pui-color-accent-soft);
    --ls-selected-bg: var(--pui-color-surface-selected);
    --ls-selected-border: var(--pui-color-border-strong);
    --ls-hover-bg: var(--pui-color-surface-hover);
    --ls-space-1: var(--pui-space-1);
    --ls-space-2: var(--pui-space-2);
    --ls-space-3: calc(var(--pui-space-2) + var(--pui-space-1));
    --ls-space-4: var(--pui-space-3);
    --ls-space-5: var(--pui-space-4);
    --ls-space-6: var(--pui-space-5);
    --ls-space-7: var(--pui-space-6);
    --ls-space-8: var(--pui-space-7);
    --ls-radius-sm: var(--pui-radius-sm);
    --ls-radius-md: var(--pui-radius-md);
    --ls-font-stack: var(--pui-font-family-base);
}

.series-landing,
.series-reader,
.series-reader__mobile-toc,
.wizard-panel {
    font-family: var(--ls-font-stack);
    color: var(--ls-text-primary);
}

.series-landing a,
.series-reader a,
.wizard-panel a {
    color: var(--ls-accent);
    text-decoration: none;
    font-weight: 500;
}

.series-landing a:hover,
.series-reader a:hover,
.wizard-panel a:hover {
    text-decoration: underline;
}

.series-landing :focus-visible,
.series-reader :focus-visible,
.wizard-panel :focus-visible {
    outline: var(--pui-focus-width) solid var(--focus-ring-colour);
    outline-offset: var(--pui-space-1);
}

.series-reader p,
.series-reader li,
.series-reader dd,
.series-reader dt,
.series-landing p,
.series-landing li {
    color: var(--ls-text-secondary);
    font-size: 18px;
    font-weight: 400;
    line-height: 1.75;
}

.series-reader h1,
.series-reader h2,
.series-reader h3,
.series-landing h1,
.series-landing h2,
.series-landing h3 {
    color: var(--ls-text-primary);
    line-height: 1.25;
}

/* ---- Skip link ---- */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    padding: var(--ls-space-2) var(--ls-space-4);
    background: var(--ls-accent);
    color: var(--pui-color-text-on-accent);
    font-weight: 600;
    z-index: 9999;
    border-radius: 0 0 var(--ls-radius-sm) var(--ls-radius-sm);
}
.skip-link:focus { left: 0; }

/* ---- Series Landing ---- */
.series-landing {
    max-width: var(--site-shell-max-width, var(--page-max-width));
    margin: 0 auto;
    padding: 0 0 var(--ls-space-8);
    background: transparent;
}

.series-landing__header { padding: var(--ls-space-6) 0 var(--ls-space-5); }

.series-landing__header h1 {
    margin: 0 0 var(--ls-space-4);
    font-size: 36px;
    font-weight: 700;
}

.series-landing__intro {
    max-width: 64ch;
    margin: 0;
    color: var(--ls-text-secondary);
}

.series-landing__loading {
    margin: 0;
    padding: var(--ls-space-6) var(--ls-space-5);
    color: var(--ls-text-muted);
}

.series-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--ls-space-5);
}

.series-card {
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-sm);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-3);
    background: var(--ls-bg-section);
}

.series-card__title { font-size: 22px; font-weight: 600; margin: 0; }
.series-card__desc  { font-size: 16px; color: var(--ls-text-secondary); flex: 1; margin: 0; }
.series-card__meta  { font-size: 14px; color: var(--ls-text-muted); }
.series-card__actions { margin-top: auto; display: flex; gap: var(--ls-space-2); }

/* ---- Series Reader layout ---- */
.series-reader {
    display: grid;
    grid-template-columns: 240px 760px 260px;
    grid-template-areas: "left main right";
    gap: 40px;
    min-height: calc(100vh - 64px);
    align-items: start;
    max-width: var(--site-shell-max-width, var(--page-max-width));
    margin: 0 auto;
    padding: 0 0 var(--ls-space-8);
    background: transparent;
}

.series-reader__rail--left,
.series-reader__rail--right {
    position: sticky;
    top: 64px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    padding: var(--ls-space-5) var(--ls-space-4);
    background: var(--ls-bg-section);
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-md);
}

.series-reader__rail--left { grid-area: left; }

.series-reader__rail-tool {
    margin-top: var(--ls-space-5);
    padding-top: var(--ls-space-4);
    border-top: 1px solid var(--ls-border);
}

.series-reader__main {
    grid-area: main;
    width: 760px;
    max-width: 100%;
    min-width: 0;
    padding: var(--ls-space-6) 0 var(--ls-space-8);
}

.series-reader__rail--right { grid-area: right; }

.series-reader__loading,
.series-reader__not-found {
    padding: var(--ls-space-6);
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-md);
    background: var(--ls-bg-section);
}

/* ---- Mobile TOC ---- */
.series-reader__mobile-toc {
    display: none;
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-md);
    margin-bottom: var(--ls-space-5);
    overflow: hidden;
    background: var(--ls-bg-section);
}

.mobile-toc__toggle {
    width: 100%;
    padding: var(--ls-space-3) var(--ls-space-4);
    text-align: left;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--ls-space-2);
}

.mobile-toc__toggle:focus-visible { outline-offset: -2px; }

.mobile-toc__panel {
    display: none;
    padding: var(--ls-space-4);
    background: var(--ls-bg-page);
    border-top: 1px solid var(--ls-border);
}

.series-reader__mobile-toc--open .mobile-toc__panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--ls-space-5);
}

.mobile-toc__group-label {
    display: block;
    margin-bottom: var(--ls-space-2);
    color: var(--ls-text-muted);
    font-size: 14px;
    font-weight: 600;
}

/* ---- Focus-visible styles for interactive controls ---- */
.timeline-step__header:focus-visible,
.dl-panel__header:focus-visible,
.section-nav-rail__link:focus-visible,
.series-nav-rail__link:focus-visible,
.walkthrough-controls .btn-ghost:focus-visible,
.dl-actions .btn-ghost:focus-visible,
.example-card .btn-ghost:focus-visible,
.btn-icon:focus-visible,
.btn-ghost:focus-visible {
    border-radius: 6px;
}

/* ---- Series Nav Rail ---- */
.series-nav-rail { display: flex; flex-direction: column; gap: var(--ls-space-4); }

.series-nav-rail__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--ls-space-2);
    padding-bottom: var(--ls-space-3);
    border-bottom: 1px solid var(--ls-border);
}

.series-nav-rail__title {
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-text-primary);
}

.series-nav-rail__browse {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: var(--ls-bg-component);
    border: 1px solid var(--ls-border);
    color: var(--ls-accent);
}

.series-nav-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.series-nav-rail__item {
    margin: 0;
}

.series-reader .series-nav-rail__link {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: var(--ls-space-2);
    width: 100%;
    min-height: 44px;
    padding: var(--ls-space-2) var(--ls-space-3);
    border: 1px solid transparent;
    border-radius: var(--ls-radius-sm);
    font-size: 14px;
    line-height: 1.5;
    color: var(--ls-text-secondary);
    text-decoration: none;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
    -webkit-touch-callout: none;
    box-shadow: inset 2px 0 0 transparent;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, opacity 0.1s ease;
}

.series-nav-rail__num {
    color: var(--ls-text-muted);
    font-weight: 600;
}

.series-nav-rail__label {
    min-width: 0;
    color: inherit;
    overflow-wrap: anywhere;
}

/* Inactive link row */
.series-reader .series-nav-rail__link {
    cursor: pointer;
}

.series-nav-rail__link *,
.series-nav-rail__link::before,
.series-nav-rail__link::after {
    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;
}

.series-reader .series-nav-rail__link:visited {
    color: var(--ls-text-secondary);
    text-decoration: none;
}

.series-reader .series-nav-rail__link:hover {
    background: var(--ls-hover-bg);
    color: var(--ls-text-primary);
    text-decoration: none;
}

.series-reader .series-nav-rail__link:active {
    opacity: 0.85;
    text-decoration: none;
}

.series-reader .series-nav-rail__link:focus-visible {
    outline: var(--pui-focus-width) solid var(--focus-ring-colour);
    outline-offset: var(--pui-space-1);
    border-radius: var(--ls-radius-sm);
}

.series-reader .series-nav-rail__link--current {
    background: var(--ls-selected-bg);
    border-color: var(--ls-selected-border);
    color: var(--ls-text-primary);
    font-weight: 600;
    box-shadow:
        inset 2px 0 0 var(--ls-accent),
        0 0 0 1px var(--pui-color-border-subtle);
}

.series-reader .series-nav-rail__link--current:hover {
    background: var(--ls-selected-bg);
    color: var(--ls-text-primary);
}

.series-reader .series-nav-rail__link--current .series-nav-rail__num {
    color: var(--ls-accent);
}

.series-reader .series-nav-rail__browse,
.series-reader .series-nav-rail__browse:hover,
.series-reader .series-nav-rail__browse:visited {
    text-decoration: none;
}

/* ---- Section Nav Rail ---- */
.section-nav-rail { display: flex; flex-direction: column; gap: var(--ls-space-3); }

.section-nav-rail__heading {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-text-primary);
}

.section-nav-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.section-nav-rail__link {
    background: none;
    border: none;
    cursor: pointer;
    display: block;
    width: 100%;
    text-align: left;
    padding: var(--ls-space-1) var(--ls-space-2);
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--ls-toc-text);
}

.section-nav-rail__link:hover {
    background: var(--ls-hover-bg);
    color: var(--ls-text-primary);
}

.section-nav-rail__item--active .section-nav-rail__link,
.section-nav-rail__link[aria-current="location"] {
    color: var(--ls-accent);
    font-weight: 600;
}

.section-nav-rail__item--level-2 .section-nav-rail__link { padding-left: var(--ls-space-5); }

.section-nav-rail__item--backtop {
    margin-top: var(--ls-space-3);
    padding-top: var(--ls-space-3);
    border-top: 1px solid var(--ls-border);
}

.section-nav-rail__link--backtop {
    font-size: 13px;
    color: var(--ls-text-muted);
}

/* ---- Wizard ---- */
.wizard-overlay {
    position: fixed;
    inset: 0;
    background: color-mix(in srgb, var(--ls-text-primary) 38%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
    padding: var(--ls-space-4);
}

.wizard-panel {
    background: var(--ls-bg-page);
    border: 1px solid var(--ls-border);
    border-radius: 12px;
    width: min(100%, 640px);
    max-height: 88vh;
    display: flex;
    flex-direction: column;
}

.wizard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--ls-space-5);
    border-bottom: 1px solid var(--ls-border);
}

.wizard-header h2 { font-size: 22px; font-weight: 600; margin: 0; color: var(--ls-text-primary); }

.wizard-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
    color: var(--ls-text-muted);
}

.wizard-steps {
    display: flex;
    gap: var(--ls-space-2);
    padding: var(--ls-space-4) var(--ls-space-5);
    border-bottom: 1px solid var(--ls-border);
}

.wizard-step-indicator {
    font-size: 14px;
    padding: var(--ls-space-1) var(--ls-space-3);
    border-radius: 999px;
    font-weight: 500;
    background: var(--ls-bg-component);
    color: var(--ls-text-muted);
}

.wizard-step-indicator[aria-current="step"] {
    background: var(--ls-accent);
    color: var(--pui-color-text-on-accent);
}

.wizard-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--ls-space-5);
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-4);
}

.wizard-footer {
    padding: var(--ls-space-4) var(--ls-space-5);
    border-top: 1px solid var(--ls-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--ls-space-3);
}

.wizard-search,
.glossary__search {
    width: 100%;
    padding: var(--ls-space-2) var(--ls-space-3);
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-sm);
    font-size: 14px;
    color: var(--ls-text-primary);
    background: var(--ls-bg-page);
}

.wizard-heading { font-size: 14px; font-weight: 600; color: var(--ls-text-secondary); margin: 0; }

.wizard-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.wizard-list-item {
    display: flex;
    align-items: flex-start;
    gap: var(--ls-space-3);
    padding: var(--ls-space-3);
    border-radius: var(--ls-radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
}

.wizard-list-item:hover { background: var(--ls-bg-component); }

.wizard-list-item[aria-selected="true"],
.wizard-list-item--selected {
    border-color: var(--ls-selected-border);
    background: var(--ls-selected-bg);
}

.wizard-list-item--sub { padding-left: var(--ls-space-6); }
.wizard-item__number { width: 1.5em; text-align: center; font-weight: 600; color: var(--ls-accent); flex-shrink: 0; }
.wizard-item__content { display: flex; flex-direction: column; }
.wizard-item__label { font-weight: 500; font-size: 14px; color: var(--ls-text-primary); }
.wizard-item__sub    { font-size: 14px; color: var(--ls-text-muted); }
.wizard-empty { color: var(--ls-text-muted); font-size: 14px; }

/* ---- Article Header ---- */
.article-header {
    border-bottom: 1px solid var(--ls-border);
    padding-bottom: var(--ls-space-5);
    margin-bottom: var(--ls-space-1);
}

.article-header__title {
    font-size: 36px;
    font-weight: 700;
    margin: 0 0 var(--ls-space-4);
    line-height: 1.25;
    color: var(--ls-text-primary);
}

.article-header__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--ls-space-2) var(--ls-space-4);
    font-size: 14px;
    color: var(--ls-text-muted);
    line-height: 1.5;
}

.article-header__corrections { color: var(--ls-accent); }

/* ---- Common article section ---- */
.article-section {
    margin: 0;
    padding: var(--ls-space-7) 0;
    scroll-margin-top: 92px;
}

.article-section + .article-section {
    border-top: 1px solid var(--ls-border);
}

.article-section__heading {
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 var(--ls-space-5);
    color: var(--ls-text-primary);
}

.article-subsection {
    margin-top: var(--ls-space-6);
    scroll-margin-top: 92px;
}

.article-subsection__heading {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 var(--ls-space-3);
    color: var(--ls-text-primary);
}

.article-section p,
.article-subsection p,
.worked-examples__intro {
    margin: 0 0 var(--ls-space-4);
}

.article-section ul,
.article-section ol {
    margin: 0 0 var(--ls-space-4);
    padding-left: 1.25rem;
}

/* ---- Definitions ---- */
.definitions-group {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-4);
    margin-top: var(--ls-space-5);
}

.def-card {
    border: 1px solid var(--ls-border);
    border-radius: 10px;
    overflow: hidden;
    background: var(--pui-color-card-background);
    scroll-margin-top: 92px;
}

.def-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ls-space-3);
    padding: var(--ls-space-4);
    background: var(--ls-bg-section);
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
}

.def-card__term    { font-size: 22px; font-weight: 600; margin: 0; color: var(--ls-text-primary); }
.def-card__chevron { font-size: 12px; color: var(--ls-text-muted); }

.def-card__body {
    padding: var(--ls-space-4) var(--ls-space-4) var(--ls-space-5);
    border-top: 1px solid var(--ls-border);
}

.def-card__actions { display: flex; justify-content: flex-end; margin-top: var(--ls-space-3); }

/* ---- Walkthrough ---- */
.walkthrough-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-3);
    margin-top: var(--ls-space-5);
}

.timeline-step {
    border: 1px solid var(--ls-border);
    border-radius: 10px;
    background: var(--ls-bg-page);
    scroll-margin-top: 92px;
}

.timeline-step__header {
    display: flex;
    align-items: center;
    gap: var(--ls-space-3);
    padding: var(--ls-space-4);
    background: var(--ls-bg-section);
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
}

.timeline-step__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--ls-accent);
    color: var(--pui-color-text-on-accent);
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.timeline-step__title  { flex: 1; font-weight: 600; color: var(--ls-text-primary); }
.timeline-step__chevron { font-size: 12px; color: var(--ls-text-muted); }

.timeline-step__body {
    padding: var(--ls-space-4) var(--ls-space-4) var(--ls-space-5);
    border-top: 1px solid var(--ls-border);
}

.walkthrough-controls {
    display: flex;
    gap: var(--ls-space-2);
    margin-top: var(--ls-space-4);
}

/* ---- Decision Loop ---- */
.decision-loop {
    margin-top: var(--ls-space-5);
    padding: 28px;
    border-radius: 12px;
    background: var(--ls-bg-component);
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    counter-reset: decision-step;
}

.dl-panel {
    border: 1px solid var(--ls-border);
    border-radius: 10px;
    background: var(--ls-bg-page);
    scroll-margin-top: 92px;
}

.dl-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--ls-space-3);
    padding: var(--ls-space-4);
    background: transparent;
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
}

.dl-panel__title {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--ls-text-primary);
}

.dl-panel__title::before {
    counter-increment: decision-step;
    content: counter(decision-step);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--ls-accent);
    color: var(--pui-color-text-on-accent);
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}

.dl-panel__chevron { font-size: 12px; color: var(--ls-text-muted); }

.dl-panel__body {
    padding: var(--ls-space-4) var(--ls-space-4) var(--ls-space-5);
    border-top: 1px solid var(--ls-border);
}

.dl-actions { display: flex; justify-content: flex-start; margin-top: var(--ls-space-4); }

/* ---- Worked Examples ---- */
.worked-examples-group { display: flex; flex-direction: column; gap: var(--ls-space-4); margin-top: var(--ls-space-5); }

.example-card {
    border: 1px solid var(--ls-border);
    border-radius: 10px;
    background: var(--ls-bg-section);
    padding: var(--ls-space-5);
    margin: 0;
    scroll-margin-top: 92px;
}

.example-card__heading {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 var(--ls-space-3);
    color: var(--ls-text-primary);
}

.example-card__assumptions { margin-top: var(--ls-space-4); }
.example-card__assumptions-list { margin: var(--ls-space-3) 0 0 1rem; }

/* ---- Checklists ---- */
.checklists-group {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-6);
    margin-top: var(--ls-space-5);
}

.checklist-card {
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-sm);
    padding: 20px;
    background: var(--ls-bg-section);
    scroll-margin-top: 92px;
    overflow: hidden;
}

.checklist-card__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--ls-space-3);
    margin-bottom: var(--ls-space-4);
}

.checklist-card__title {
    font-size: 22px;
    font-weight: 600;
    margin: 0;
    color: var(--ls-text-primary);
}

.checklist-card__groups {
    display: flex;
    flex-direction: column;
}

.checklist-group + .checklist-group {
    margin-top: var(--ls-space-3);
}

.checklist-group__title {
    margin: var(--ls-space-3) 0 var(--ls-space-2);
    font-size: 16px;
    font-weight: 600;
    color: var(--ls-text-primary);
}

.checklist-group:first-child .checklist-group__title {
    margin-top: 0;
}

.checklist-card__items {
    list-style: none;
    margin: 0;
    padding: 0 0 0 var(--ls-space-3);
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-2);
}

.checklist-group__items {
    margin-bottom: 0;
}

.checklist-card__item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px;
    align-items: start;
}

.checklist-card__item input[type="checkbox"] {
    margin-top: .2rem;
    accent-color: var(--ls-accent);
}

.checklist-card__item label {
    min-width: 0;
    word-break: break-word;
    overflow-wrap: anywhere;
}

.checklist-card__item-label {
    grid-column: 1 / -1;
    min-width: 0;
    word-break: break-word;
    overflow-wrap: anywhere;
}

/* Guardrail: prevent inherited writing-mode / text-orientation from ancestors */
.article-section--checklists,
.article-section--checklists * {
    writing-mode: horizontal-tb !important;
    text-orientation: mixed !important;
}

.checklist-card__footer {
    margin-top: var(--ls-space-4);
    padding-top: var(--ls-space-3);
    border-top: 1px solid var(--ls-border);
    font-size: 14px;
    color: var(--ls-text-muted);
}

/* ---- Glossary ---- */
.glossary__search { margin-bottom: var(--ls-space-5); }

.glossary-list {
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-5);
}

.glossary-entry { scroll-margin-top: 92px; }

.glossary-entry__term {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 var(--ls-space-2);
    color: var(--ls-text-primary);
}

.glossary-entry__def {
    margin: 0;
    display: flex;
    gap: var(--ls-space-3);
    align-items: flex-start;
    flex-wrap: wrap;
}

.glossary__empty {
    color: var(--ls-text-muted);
    margin: 0;
}

/* ---- Verified Callouts ---- */
.verified-callouts-group {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-6);
    margin-top: var(--ls-space-5);
}

.verified-callout {
    border: 1px solid var(--ls-border);
    border-left: 4px solid var(--ls-accent);
    border-radius: var(--ls-radius-sm);
    padding: 20px;
    background: var(--ls-bg-component);
    scroll-margin-top: 92px;
}

.verified-callout__header {
    display: flex;
    align-items: center;
    gap: var(--ls-space-3);
    margin-bottom: var(--ls-space-2);
}

.verified-callout__badge {
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-accent);
    background: var(--ls-accent-soft);
    padding: var(--ls-space-1) var(--ls-space-2);
    border-radius: 999px;
}

.verified-callout__date { font-size: 14px; color: var(--ls-text-muted); }

.verified-callout__title {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 var(--ls-space-2);
    color: var(--ls-text-primary);
}

.verified-callout__text { margin: 0 0 var(--ls-space-3); }

.verified-callout__footer {
    display: flex;
    gap: var(--ls-space-3);
    align-items: center;
    font-size: 14px;
}

.verified-callout__sources-link { color: var(--ls-accent); }

/* ---- Internal Links ---- */
.internal-links__group-heading {
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-text-secondary);
    margin: 0 0 var(--ls-space-2);
}

.internal-links__list {
    list-style: none;
    margin: 0 0 var(--ls-space-5);
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.internal-links__link { color: var(--ls-accent); font-size: 16px; }

/* ---- Article nav (prev/next) ---- */
.series-reader__article-nav {
    display: flex;
    justify-content: space-between;
    gap: var(--ls-space-5);
    padding-top: var(--ls-space-6);
    margin-top: var(--ls-space-6);
    border-top: 1px solid var(--ls-border);
}

.series-reader__article-nav--top {
    margin-top: 0;
    margin-bottom: var(--ls-space-6);
}

.article-nav__prev,
.article-nav__next {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.article-nav__next { align-items: flex-end; text-align: right; }

.article-nav__dir {
    font-size: 14px;
    color: var(--ls-text-muted);
    font-weight: 500;
}

.article-nav__title {
    font-size: 16px;
    color: var(--ls-text-primary);
    font-weight: 600;
}

/* ---- Generic section ---- */
.article-section--generic ul { padding-left: 1.25rem; }

/* ---- Series Browser (inline 3-col navigator) ---- */
.series-browser {
    display: grid;
    grid-template-columns: 240px 1fr 1fr;
    border: 1px solid var(--ls-border);
    border-radius: 12px;
    overflow: hidden;
    height: calc(100vh - 240px);
    min-height: 520px;
    background: var(--ls-bg-page);
}

.series-browser__col {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-right: 1px solid var(--ls-border);
}

.series-browser__col:last-child { border-right: none; }

.series-browser__col-header {
    padding: var(--ls-space-3) var(--ls-space-4);
    font-size: 14px;
    font-weight: 600;
    color: var(--ls-text-primary);
    border-bottom: 1px solid var(--ls-border);
    background: var(--ls-bg-section);
    flex-shrink: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.series-browser__list {
    list-style: none;
    margin: 0;
    padding: var(--ls-space-2);
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
}

.series-browser__list--sections { padding: var(--ls-space-3); }

.series-browser__item {
    display: flex;
    flex-direction: column;
    gap: var(--ls-space-1);
    padding: var(--ls-space-3);
    border-radius: var(--ls-radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    list-style: none;
}

.series-browser__item:hover { background: var(--ls-bg-section); }

.series-browser__item--active {
    background: var(--ls-selected-bg);
    border-color: var(--ls-selected-border);
}

.series-browser__list--ordered .series-browser__item {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--ls-space-3);
}

.series-browser__item-title { font-weight: 500; font-size: 16px; line-height: 1.5; color: var(--ls-text-primary); }
.series-browser__item-meta  { font-size: 14px; color: var(--ls-text-muted); }
.series-browser__item-num   { font-size: 14px; font-weight: 700; color: var(--ls-accent); flex-shrink: 0; padding-top: var(--ls-space-1); min-width: 1.4rem; }
.series-browser__item-body  { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.series-browser__item-desc  { font-size: 14px; color: var(--ls-text-secondary); margin-top: var(--ls-space-1); }

.series-browser__empty {
    padding: var(--ls-space-5);
    color: var(--ls-text-muted);
    font-size: 14px;
    margin: 0;
}

.series-browser__open-bar {
    padding: var(--ls-space-3) var(--ls-space-4);
    border-bottom: 1px solid var(--ls-border);
    background: var(--ls-bg-section);
    flex-shrink: 0;
}

.series-browser__section { list-style: none; }

.series-browser__section-link {
    display: block;
    padding: var(--ls-space-2) var(--ls-space-3);
    border-radius: var(--ls-radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--ls-text-secondary);
    text-decoration: none;
}

.series-browser__section-link:hover {
    background: var(--ls-hover-bg);
    color: var(--ls-accent);
    text-decoration: none;
}

.series-browser__subsections {
    list-style: none;
    padding: 0;
    margin: 0;
}

.series-browser__subsection-link {
    display: block;
    padding: var(--ls-space-1) var(--ls-space-3) var(--ls-space-1) var(--ls-space-6);
    border-radius: var(--ls-radius-sm);
    font-size: 14px;
    color: var(--ls-text-muted);
    text-decoration: none;
}

.series-browser__subsection-link:hover {
    background: var(--ls-hover-bg);
    color: var(--ls-accent);
    text-decoration: none;
}

/* ---- Small utility buttons ---- */
.btn-icon,
.btn-ghost {
    border: 1px solid var(--ls-border);
    border-radius: var(--ls-radius-sm);
    cursor: pointer;
    color: var(--ls-text-secondary);
    background: var(--pui-color-surface-control);
}

.btn-icon {
    font-size: 14px;
    padding: var(--ls-space-1) var(--ls-space-3);
}

.btn-ghost {
    padding: var(--ls-space-2) var(--ls-space-4);
    font-size: 14px;
}

.btn-icon:hover,
.btn-ghost:hover {
    background: var(--ls-hover-bg);
}

.btn-sm {
    font-size: 14px;
    padding: var(--ls-space-1) var(--ls-space-3);
}

/* ---- Breakpoints ---- */
@media (max-width: 1280px) {
    .series-reader {
        grid-template-columns: 240px minmax(0, 1fr);
        grid-template-areas: "left main";
        gap: var(--ls-space-5);
    }

    .series-reader__rail--right { display: none; }

    .series-reader__main {
        width: auto;
        max-width: 760px;
    }

    .series-reader__mobile-toc { display: block; }

    .series-browser {
        grid-template-columns: 1fr;
        height: auto;
        min-height: 0;
    }

    .series-browser__col {
        border-right: none;
        border-bottom: 1px solid var(--ls-border);
        max-height: 320px;
    }

    .series-browser__col:last-child { border-bottom: none; }
}

@media (max-width: 768px) {
    .series-landing { padding: 0 var(--ls-space-4) var(--ls-space-7); }
    .series-landing__header { padding-top: var(--ls-space-5); }
    .series-landing__header h1 { font-size: 32px; }

    .series-reader {
        grid-template-columns: 1fr;
        grid-template-areas: "main";
        gap: 0;
        padding: 0 var(--ls-space-4) var(--ls-space-7);
    }

    .series-reader__rail--left,
    .series-reader__rail--right { display: none; }

    .series-reader__main {
        width: 100%;
        max-width: none;
        padding-top: var(--ls-space-5);
    }

    .series-reader__mobile-toc--open .mobile-toc__panel {
        grid-template-columns: 1fr;
    }

    .article-header__title { font-size: 32px; }
    .article-section__heading { font-size: 26px; }
    .article-subsection__heading,
    .example-card__heading,
    .checklist-card__title,
    .verified-callout__title,
    .glossary-entry__term,
    .def-card__term { font-size: 22px; }

    .decision-loop { padding: var(--ls-space-5); }
}